Climate change is a result of the greatest market failure the world has seen...We risk damages on a scale larger than the two world wars of the last century.

The scientific evidence is now overwhelming: climate change presents very serious global risks, and it demands an urgent global response.

A rise of 5C would be a temperature the world has not seen for 30 to 50 million years. We've been around only 100,000 years as human beings. We don't know what that's like.

Meat is a wasteful use of water and creates a lot of greenhouse gases. It puts enormous pressure on the world's resources. A vegetarian diet is better.

The one way of guaranteeing to fail is to assume that we will.

Enlightened self-interest from those involved in hydrocarbons should lead to the support of technologies enabling the clean use of hydrocarbons, such as carbon capture and storage, and not to the defence of deniers and cranks.

As an undergraduate, I did maths and physics. That doesn't make me a scientist. So I try to read and understand and talk to scientists.